WO2010091830A1 - Luminous flux measurement of the light emitting diodes - Google Patents
Luminous flux measurement of the light emitting diodes Download PDFInfo
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- WO2010091830A1 WO2010091830A1 PCT/EP2010/000755 EP2010000755W WO2010091830A1 WO 2010091830 A1 WO2010091830 A1 WO 2010091830A1 EP 2010000755 W EP2010000755 W EP 2010000755W WO 2010091830 A1 WO2010091830 A1 WO 2010091830A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0474—Diffusers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J2001/0481—Preset integrating sphere or cavity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
- G01J2001/4252—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources for testing LED's
Definitions
- the invention relates to a method according to the preamble of the main claim.
- the method relates to the fact that polychromatic optical radiators of the same physical radiation power produce different brightness impressions depending on the wavelengths in the eye which are dominant therein.
- This color-dependent light sensitivity can be represented as a so-called brightness curve, which was recorded empirically and standardized in 1924. It represents the spectral sensitivity of the human eye.
- Optical intensity measuring devices therefore work with a bandpass filter approximating this brightness curve for vaporising the color components which are physiologically most pronounced.
- the integral of the frequency-dependent filtered intensity measurement over the spectrum of the radiator is referred to as its luminous flux measured in lumens.
- LEDs monochromatic light-emitting diodes
- the invention is based on the knowledge of the inventor that in practice the absorption curve of a solid color filter with bandpass behavior connected upstream of the spectrometer can be approximated to the predetermined brightness curve only over a certain spectral range, and even there only with moderate accuracy;
- Brightness curve turns out to be quite unusable in monochromatic light, it leads in LEDs only to poor to false and hardly reproducible luminous flux results.
- the present invention provides the technical
- This object is achieved by the essential features specified in the main claim.
- This solution is based on the idea of using the spectrometer only for its actual task, namely for detecting the current radiation spectrum. Thus, in the spectrometer, no intensity determination is made on the frequency response and therefore no
- the total radiated radiometric power of the radiator is measured by a photometer, outside the spectrometer, and then given an absolute rating, which is then multiplicatively linked to the relative spectrum of the radiometer and evaluated for brightness.
- the detection of the power over the entire spectrum provides only a small and therefore negligible systematic error if the radiator does not provide any significant power outside the visible spectrum and in particular only one - relative to the width of the optical spectrum - relatively monochromatic light emits, as in Case of a light emitting diode.
- Their radiation spectrum is therefore no longer optically bandpass filtered, but it is from a tabular deposited
- Filter curve frequency-dependent brightness-weighted This spectral absorption curve can be easily and reproducibly adapted to the current spectral conditions of the radiators such as peak wavelength and half-width of an LED charge to be measured by changes in the table.
- the simultaneous but separate energetic and spectral measurement of the radiator for determining its luminous flux is expediently behind a diffuser about the manner of a diffuser, preferably in the design of a three-port integrating sphere.
- a power-calibrated unfiltered photodiode as a photometric radiation power meter and a simple, likewise unfiltered operated spectrometer for recording the relative spectrum of the radiation of the radiator are needed.
- Brightness rating from the tabular stored, variable brightness curve is done, which corresponds due to the integration mathematically a convolution.
- a with respect to its luminous flux L to be measured radiator 11 - in particular a light emitting diode (LED) - is the radiation side directed into the highly diffuse reflective interior of an integrating sphere 12. Due to the superpositions of multiple reflections on the
- Ball inner wall surface is not a possible geometric beam characteristic of the radiation in the measurement results.
- the measurements are made in each case transversely to the direction of irradiation and therefore glare-free, with a photometer 13 (for example simply a power-calibrated photodiode) and a spectrometer 14 recording the irradiated emission spectrum in each case unfiltered.
- a photometer 13 for example simply a power-calibrated photodiode
- a spectrometer 14 recording the irradiated emission spectrum in each case unfiltered.
- the spectrometer 14 works here only in its very own function, in a sense only as a spectroscope; because it provides only the relative intensity over the wavelength over the detected spectral range, typically a section of the visible spectrum; basically just a binary 1-0 (yes-no) statement about it, which of quantized successive spectral components in the emission spectrum of the radiator 1 1 are present, and which are not.
- the photometer 13 delivers, also unfiltered, only the radiometric radiated power P (in watts) of the radiator 11, ie without consideration of the spectral components contained therein.
- This measured radiometric power P is proportional to the area under the spectrum w.
- the spectrum area therefore gives the sought luminous flux L after evaluation with a brightness curve D (w).
- the measured power P is multiplicatively linked in a computer 15 with the binary acquired spectrum w to Pw.
- this can be achieved simply by means of a blanking switch, which only switches through the measured power Pw to a modulator 16 when the spectrometer 14 reports the presence of 1 w of a currently sampled, quantized spectral component w.
- the module gate 16 effects the attenuation D (w) of the spectral power Pw stored in a color table 17 in accordance with the currently occurring spectral component 1w.
- the thus color-dependent brightness-weighted power measured values PD are summed in an integrator 18 and output for this radiator 11 as the luminous flux L (11), measured in lumens.
- the determination of the luminous flux L thus takes place according to the invention separately, without fixed filter characteristics in parallel, according to the radiometric radiation power P and the course of the optical radiation spectrum w of a radiator 11 by means of
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Spectrometry And Color Measurement (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
LICHTSTROMMESSUNG VON LEUCHTDIODEN LIGHT CURRENT MEASUREMENT OF LUMINAIRE DIODES
Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a method according to the preamble of the main claim.
Das Verfahren bezieht sich darauf, dass polychromatische optische Strahler gleicher physikalischer Strahlungsleistung je nach den darin dominierenden Wellenlängen im Auge unterschiedliche Helligkeitseindrücke hervorrufen. Diese farbabhängige Hellempfindlichkeit ist als so genannte Helligkeitskurve darstellbar, die empirisch erfasst und 1924 genormt wurde. Sie repräsentiert die spektrale Empfindlichkeit des menschlichen Auges. Optische Intensitätsmessgeräte arbeiten deshalb mit einem diese Helligkeitskurve annähernden Bandfilter zum Bedampfen der physiologisch am kräftigsten in Erscheinung tretenden Farbanteile. Das Integral der so frequenzabhängig gefilterten Intensitätsmessung über dem Spektrum des Strahlers wird als dessen in Lumen gemessener Lichtstrom bezeichnet.The method relates to the fact that polychromatic optical radiators of the same physical radiation power produce different brightness impressions depending on the wavelengths in the eye which are dominant therein. This color-dependent light sensitivity can be represented as a so-called brightness curve, which was recorded empirically and standardized in 1924. It represents the spectral sensitivity of the human eye. Optical intensity measuring devices therefore work with a bandpass filter approximating this brightness curve for vaporising the color components which are physiologically most pronounced. The integral of the frequency-dependent filtered intensity measurement over the spectrum of the radiator is referred to as its luminous flux measured in lumens.
Bei zwei nebeneinander betriebenen, an sich gleichfarbigen Strahlern ist anzustreben, dass sie auch durch möglichst übereinstimmenden Lichtstrom charakterisiert sind, um nicht unangenehm in Erscheinung tretende Sprünge zwischen den beiden unmittelbar benachbarten Farbeindrucken auftreten zu lassen. Zur Bestückung von hochwertigenIn the case of two side-by-side radiators, which are of the same color, it is desirable that they are also characterized by a luminous flux that is as consistent as possible so as not to cause unpleasant jumps between the two immediately adjacent color impressions. For equipping high quality
Farblichtsystemen, wie bei einer Flugzeug-Bordbeleuchtung, mit - bezogen auf das sichtbare Spektrum relativ monochromatischen - Leuchtdioden (LEDs) erfolgt deshalb aus dem Fertigungslos einer LED-Farbe noch eine Selektion von mit ihrem jeweiligen Lichtstrom möglichst übereinstimmenden LEDs, um eine Farbgenauigkeit in der Größenordnung von nur noch einem Promille Abweichung zu erzielen.Color light systems, such as aircraft on-board lighting, with respect to the visible spectrum relatively monochromatic light-emitting diodes (LEDs) therefore takes place from the Fertigungslos an LED color nor a selection of their respective luminous flux as possible matching LEDs to a color accuracy of the order of only one per thousand deviation.
Der Erfindung liegt die Erkenntnis des Erfinders zugrunde, dass sich in der Praxis die Absorptionskurve eines dem Spektrometer vorgeschalteten festen Farbfilters mit Bandpassverhalten nur über einen gewissen Spektralbereich hinweg, und auch da nur mäßig genau, an die vorgegebene Helligkeitskurve annähern lässt; wobei dieThe invention is based on the knowledge of the inventor that in practice the absorption curve of a solid color filter with bandpass behavior connected upstream of the spectrometer can be approximated to the predetermined brightness curve only over a certain spectral range, and even there only with moderate accuracy; the
Genauigkeit der Intensitätsmessung bei den handelsüblichen Spektrometem ohnehin zu wünschen übrig lässt. Hinzu kommt, dass zu den Randbereichen des sichtbaren Spektrums hin, und da besonders im kurzwelligen Blaubereich, die genormte Helligkeitskurve vom tatsächlichen Helligkeitsempfinden zunehmend abweicht. Das wird daran liegen, dass die Helligkeitskurve seinerzeit vor polychromatischen Strahlern wie Glühlampen ermittelt wurde, unter besonderer Berücksichtigung des physiologisch am intensivsten in Erscheinung tretenden mittleren Bereiches (Grün-Umgebung) im Spektrum des sichtbaren Lichts.Accuracy of the intensity measurement in commercial spectrometers anyway leaves something to be desired. In addition to that, the standardized ranges of the visible spectrum, and especially in the short-wave blue range Brightness curve of the actual brightness perception increasingly deviates. This will be due to the fact that the brightness curve was determined in front of polychromatic radiators such as incandescent lamps, with particular emphasis on the physiologically most intense middle region (green environment) in the spectrum of visible light.
Das wirkt sich nun störend aus, wenn im Zuge der Selektion keine breitbandigen Strahler vermessen werden, sondern Strahler wie LEDs, die - bezogen auf das sichtbare Spektrum relativ monochrom - nur in begrenzten Frequenzbereichen der Helligkeitskurve und insbesondere abseits des Grünbereiches betrieben werden sollen. Die genormteThis now has a disturbing effect if no broadband emitters are measured in the course of the selection, but emitters such as LEDs, which - relative to the visible spectrum relatively monochrome - are to be operated only in limited frequency ranges of the brightness curve and in particular away from the green area. The standardized
Helligkeitskurve erweist sich bei monochromatischem Licht als recht unbrauchbar, sie führt bei LEDs nur zu schlechten bis falschen und kaum reproduzierbaren Lichtstrom- Ergebnissen.Brightness curve turns out to be quite unusable in monochromatic light, it leads in LEDs only to poor to false and hardly reproducible luminous flux results.
In Erkenntnis dieser Gegebenheiten legt vorliegender Erfindung die technischeIn recognition of these circumstances, the present invention provides the technical
Problemstellung zugrunde, ein Verfahren gattungsgemäßer Art derart abzuwandeln, dass mit apparativ einfachen Mitteln reproduzierbar exakte Ergebnisse für den Lichtstrom ermittelt werden können und dadurch die Selektion relativ monochromer Strahler für die Bestückung von Farbleuchten präziser wird.The problem underlying this is to modify a method of the generic type in such a way that reproducibly exact results for the luminous flux can be determined with simple apparatuses, thereby making the selection of relatively monochromatic radiators for the assembly of color lamps more precise.
Diese Aufgabe ist erfindungsgemäß durch die im Hauptanspruch angegebenen wesentlichen Merkmale gelöst. Für diese Lösung ist von der Überlegung ausgegangen, das Spektrometer nur für seine eigentliche Aufgabe einzusetzen, nämlich für das Erfassen des aktuellen Strahlungs-Spektrums. Somit erfolgt im Spektrometer keine Intensitätsbestimmung über dem Frequenzgang und deshalb auch keineThis object is achieved by the essential features specified in the main claim. This solution is based on the idea of using the spectrometer only for its actual task, namely for detecting the current radiation spectrum. Thus, in the spectrometer, no intensity determination is made on the frequency response and therefore no
Helligkeitsfilterung der einzelnen Spektralanteile mehr. Stattdessen erfährt die gesamte abgestrahlte radiometrische Leistung des Strahlers mittels eines Photometers, außerhalb des Spektrometers, ihre absolute Bewertung, die dann multiplikativ mit dem relativen Spektrumsverlauf aus dem Radiometer verknüpft sowie helligkeitsbewertet wird. Das Erfassen der Leistung über das gesamte Spektrum erbringt dabei nur einen geringen und deshalb vemachlässigbaren systematischen Fehler, wenn der Strahler keine wesentliche Leistung außerhalb des sichtbaren Spektrums liefert und insbesondere nur ein - bezogen auf die Breite des optischen Spektrums - relativ monochromatisches Licht abstrahlt, wie im Falle einer Leuchtdiode. Deren Strahlungsspektrum wird also nun nicht mehr optisch bandpassgefiltert, sondern es wird aus einer tabellarisch hinterlegtenBrightness filtering of the individual spectral components more. Instead, the total radiated radiometric power of the radiator is measured by a photometer, outside the spectrometer, and then given an absolute rating, which is then multiplicatively linked to the relative spectrum of the radiometer and evaluated for brightness. The detection of the power over the entire spectrum provides only a small and therefore negligible systematic error if the radiator does not provide any significant power outside the visible spectrum and in particular only one - relative to the width of the optical spectrum - relatively monochromatic light emits, as in Case of a light emitting diode. Their radiation spectrum is therefore no longer optically bandpass filtered, but it is from a tabular deposited
Filterkurve frequenzabhängig helligkeitsbewertet. Dieser spektrale Absorptionsverlauf lässt sich durch Änderungen in der Tabelle leicht und reproduzierbar den aktuellen spektralen Gegebenheiten der Strahler wie Peak-Wellenlänge und Halbwertsbreite einer zu vermessenden LED-Charge anpassen. Die gleichzeitige aber getrennte energetische und spektrale Vermessung des Strahlers zum Bestimmen seines Lichtstromes erfolgt zweckmäßigerweise hinter einem Diffusor etwa nach Art einer Streuscheibe, bevorzugt in der Bauform einer Dreiport-Ulbrichtkugel. Als Messgeräte werden lediglich eine leistungskalibrierte ungefilterte Photodiode als photometrischer Strahlungsleistungsmesser und ein einfaches, ebenfalls ungefiltert betriebenes Spektrometer zur Aufnahme des relativen Spektrums der Abstrahlung des Strahlers benötigt. Das für die praktischen Belange interessierende Spektrum ist relativ schmal, abhängig von den Strahlungscharakteristiken der zu vermessenden LED, weshalb das Empfindlichkeitsspektrum einer üblichen Photodiode völlig ausreicht. Es ist sogar von Vorteil, dass Spektralanteile am Rande des sichtbaren Lichts, also zum Ultravioletten und zum Infraroten hin, außerhalb des Empfindlichkeitsfensters der Photodiode liegen und dadurch stark gedämpft werden, also auf die Leistungsmessung kaum Einfluss haben. Die beiden Messergebnisse werden multiplikativ verknüpft und über dieses Strahlungsspektrum integriert; wobei nun erst die farbabhängigeFilter curve frequency-dependent brightness-weighted. This spectral absorption curve can be easily and reproducibly adapted to the current spectral conditions of the radiators such as peak wavelength and half-width of an LED charge to be measured by changes in the table. The simultaneous but separate energetic and spectral measurement of the radiator for determining its luminous flux is expediently behind a diffuser about the manner of a diffuser, preferably in the design of a three-port integrating sphere. As measuring devices, only a power-calibrated unfiltered photodiode as a photometric radiation power meter and a simple, likewise unfiltered operated spectrometer for recording the relative spectrum of the radiation of the radiator are needed. The range of interest for practical purposes is relatively narrow, depending on the radiation characteristics of the LED to be measured, which is why the sensitivity spectrum of a conventional photodiode is quite sufficient. It is even advantageous that spectral components at the edge of the visible light, that is to say to the ultraviolet and infrared, are outside the sensitivity window of the photodiode and are therefore greatly attenuated, ie they have hardly any influence on the power measurement. The two measurement results are multiplicatively linked and integrated via this radiation spectrum; now only the color-dependent
Helligkeitsbewertung aus der tabellarisch hinterlegten, veränderbaren Helligkeitskurve erfolgt, was wegen der Integration mathematisch einer Faltung entspricht.Brightness rating from the tabular stored, variable brightness curve is done, which corresponds due to the integration mathematically a convolution.
Weiterbildungen und Abwandlungen der erfindungsgemäßen Lösung ergeben sich aus den weiteren Ansprüchen und, auch hinsichtlich deren Vorteilen, aus nachstehenderFurther developments and modifications of the solution according to the invention will become apparent from the other claims and, also with regard to their advantages, from the following
Beschreibung eines in der Zeichnung auf das Funktionsprinzip vereinfacht skizzierten bevorzugten Ausführungsbeispiels zur Erfindung. Die einzige Figur der Zeichnung zeigt nach Art eines einpoligen Blockschaltbildes die helligkeitsgewichtete multiplikative Verknüpfung der getrennten Spektrums- und Intensitätsermittlung zu exaktem und gut reproduzierbarem Bestimmen des Lichtstromes eines relativ monochromatischen optischen Strahlers.Description of a simplified in the drawing on the principle of operation outlined preferred embodiment of the invention. The sole figure of the drawing shows in the manner of a single-pole block diagram, the brightness-weighted multiplicative linkage of the separate spectrum and intensity determination for accurate and well reproducible determination of the luminous flux of a relatively monochromatic optical radiator.
Ein hinsichtlich seines Lichtstromes L zu vermessender Strahler 11 - insbesondere eine Leuchtdiode (LED) - ist abstrahlseitig in das stark diffus reflektierende Innere einer Ulbricht-Kugel 12 gerichtet. Infolge der Überlagerungen vielfältiger Reflektionen an derA with respect to its luminous flux L to be measured radiator 11 - in particular a light emitting diode (LED) - is the radiation side directed into the highly diffuse reflective interior of an integrating sphere 12. Due to the superpositions of multiple reflections on the
Kugelinnenwandfläche geht eine etwaige geometrische Strahlcharakteristik der Abstrahlung nicht in die Messergebnisse ein. Die Messungen erfolgen jeweils quer zur Einstrahlrichtung und deshalb blendfrei, wobei ein Photometer 13 (etwa einfach eine leistungskalibrierte Photodiode) und ein Spektrometer 14 das eingestrahlte Emissionsspektrum jeweils ungefiltert aufnehmen.Ball inner wall surface is not a possible geometric beam characteristic of the radiation in the measurement results. The measurements are made in each case transversely to the direction of irradiation and therefore glare-free, with a photometer 13 (for example simply a power-calibrated photodiode) and a spectrometer 14 recording the irradiated emission spectrum in each case unfiltered.
Das Spektrometer 14 arbeitet hier nur in seiner ureigensten Funktion, gewissermaßen nur noch als Spektroskop; denn es liefert über den erfassten Spektralbereich, typischerweise einen Ausschnitt aus dem sichtbaren Spektrum, nur die relative Intensität über der Wellenlänge; im Prinzip nur eine binäre 1-0- (Ja-Nein-) Aussage darüber, welche von quantisiert aufeinanderfolgenden Spektralanteilen im Emissionsspektrum des Strahlers 1 1 vorhanden sind, und welche nicht.The spectrometer 14 works here only in its very own function, in a sense only as a spectroscope; because it provides only the relative intensity over the wavelength over the detected spectral range, typically a section of the visible spectrum; basically just a binary 1-0 (yes-no) statement about it, which of quantized successive spectral components in the emission spectrum of the radiator 1 1 are present, and which are not.
Ein messtechnisches Erfassen physikalischer Größen und deshalb auch eine spektralabhängige Helligkeits-Filterung (Dämpfung) findet im Spektrometer 14 nicht mehr statt, die ansonsten daraus resultierenden Messfehler sind dadurch nun eliminiert.A metrological detection of physical quantities and therefore also a spectrally dependent brightness filtering (attenuation) no longer takes place in the spectrometer 14, the otherwise resulting measurement errors are now eliminated.
Das Photometer 13 liefert, ebenfalls ungefiltert, lediglich die radiometrisch abgestrahlte Leistung P (in Watt) des Strahlers 11 , also ohne Berücksichtigung der darin enthaltenen Spektralanteile.The photometer 13 delivers, also unfiltered, only the radiometric radiated power P (in watts) of the radiator 11, ie without consideration of the spectral components contained therein.
Diese gemessene radiometrische Leistung P ist der Fläche unter dem Spektrumsverlauf w proportional. Die Spektrumsfläche ergibt deshalb nach Bewertung mit einer Helligkeitskurve D(w) den gesuchten Lichtstrom L.This measured radiometric power P is proportional to the area under the spectrum w. The spectrum area therefore gives the sought luminous flux L after evaluation with a brightness curve D (w).
Dafür wird die gemessene Leistung P in einem Rechner 15 mit dem binär erfassten Spektrum w zu Pw multiplikativ verknüpft. Das ist im Prinzip einfach durch einen austastenden Schalter realisierbar, der immer nur dann die gemessene Leistung Pw auf einen Modulator 16 durchschaltet, wenn das Spektrometer 14 das Vorhandensein 1w eines aktuell abgefragten, quantisierten Spektralanteiles w meldet.For this purpose, the measured power P is multiplicatively linked in a computer 15 with the binary acquired spectrum w to Pw. In principle, this can be achieved simply by means of a blanking switch, which only switches through the measured power Pw to a modulator 16 when the spectrometer 14 reports the presence of 1 w of a currently sampled, quantized spectral component w.
Der Modultor 16 bewirkt die in einer Farbtabelle 17 hinterlegte Dämpfung D(w) der spektralen Leistung Pw nach Maßgabe des gerade anstehenden Spektralanteiles 1w. Die so farbabhängig helligkeitsgewichteten Leistungsmesswerte PD werden in einem Integrator 18 aufsummiert und für diesen Strahler 11 als der Lichtstrom L(11), gemessen in Lumen, ausgegeben.The module gate 16 effects the attenuation D (w) of the spectral power Pw stored in a color table 17 in accordance with the currently occurring spectral component 1w. The thus color-dependent brightness-weighted power measured values PD are summed in an integrator 18 and output for this radiator 11 as the luminous flux L (11), measured in lumens.
Die Bestimmung des Lichtstromes L erfolgt also nun erfindungsgemäß getrennt, ohne feste Filtercharakteristiken parallel, nach radiometrischer Strahlungsleistung P und Verlauf des optischen Strahlungsspektrums w eines Strahlers 11 mittelsThe determination of the luminous flux L thus takes place according to the invention separately, without fixed filter characteristics in parallel, according to the radiometric radiation power P and the course of the optical radiation spectrum w of a radiator 11 by means of
Messeinrichtungen einfachster Art an einer Dreiport-Ulbrichtkugel 12, nämlich mittels einer leistungskalibrierten Photodiode 13 und eines binären Spektrometers 14. Deren geschaltete Verknüpfung Pw wird aus einer veränderbaren Helligkeitstabelle 17 frequenzabhängig bedämpft. Das liefert, insbesondere für die relativ monochromatisch abstrahlenden LEDs 11 , auf kostengünstige Weise hoch reproduzierbar exakteMeasuring devices of the simplest kind on a Dreiport Ulbrichtkugel 12, namely by means of a power-calibrated photodiode 13 and a binary spectrometer 14. The switched connection Pw is attenuated from a variable brightness table 17 frequency-dependent. This provides, in particular for the relatively monochromatically emitting LEDs 11, in a cost-effective manner highly reproducible exact
Lichtstrom-Ergebnisse L(11). Luminous flux results L (11).
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| Application Number | Priority Date | Filing Date | Title |
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| DE200910008526 DE102009008526B4 (en) | 2009-02-11 | 2009-02-11 | Method for determining the luminous flux of optical emitters, in particular light-emitting diodes |
| DE102009008526.2 | 2009-02-11 |
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| WO2010091830A1 true WO2010091830A1 (en) | 2010-08-19 |
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| DE102011010393B4 (en) | 2011-02-05 | 2013-09-19 | Lufthansa Technik Ag | Test method for an escape route marking |
| DE102012109135A1 (en) * | 2012-09-27 | 2014-03-27 | Osram Opto Semiconductors Gmbh | Device for determining e.g. color location homogeneity of LED of integrated circuit, has sensor elements detecting measured values of measured magnitude of electromagnetic radiation in cube-shaped hollow body |
| DE102018120006A1 (en) * | 2018-08-16 | 2020-02-20 | Instrument Systems Optische Messtechnik Gmbh | Method and device for monitoring a spectroradiometer |
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| US20080129996A1 (en) * | 2006-11-30 | 2008-06-05 | Fu Dan University | Equipment and method for led's total luminous flux measurement with a narrow beam standard light source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6967447B2 (en) * | 2003-12-18 | 2005-11-22 | Agilent Technologies, Inc. | Pre-configured light modules |
| DE102008033544A1 (en) * | 2008-07-17 | 2010-01-21 | Osram Gesellschaft mit beschränkter Haftung | Method and device for determining calibration data, calibration unit and light source |
-
2009
- 2009-02-11 DE DE200910008526 patent/DE102009008526B4/en not_active Expired - Fee Related
-
2010
- 2010-02-06 WO PCT/EP2010/000755 patent/WO2010091830A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080129996A1 (en) * | 2006-11-30 | 2008-06-05 | Fu Dan University | Equipment and method for led's total luminous flux measurement with a narrow beam standard light source |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175315A (en) * | 2011-02-24 | 2011-09-07 | 复旦大学 | Light damage measurement instrument based on relationship between pupil size and ambient brightness |
| CN103390378A (en) * | 2013-07-19 | 2013-11-13 | 南京洛普股份有限公司 | Energy efficiency detecting method for LED display module |
| CN103390378B (en) * | 2013-07-19 | 2015-10-14 | 南京洛普股份有限公司 | LED shows module energy efficiency detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009008526B4 (en) | 2011-07-07 |
| DE102009008526A1 (en) | 2010-08-19 |
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